APA-viite (7. p.)

Houghton, P. (2002). Nine descents of the spirit: Towards inner harmony. Jessica Kingsley.

Chicago-viite (17. p.)

Houghton, Peter. Nine Descents of the Spirit: Towards Inner Harmony. London ; Philadelphia: Jessica Kingsley, 2002.

MLA-viite (9. p.)

Houghton, Peter. Nine Descents of the Spirit: Towards Inner Harmony. Jessica Kingsley, 2002.